Added remaining const coeffRef accessors to Array- and MatrixWrapper.
Added remaining const coeffRef accessors to Array- and MatrixWrapper.

mjbshaw/Eigen,rotorliu/eigen,rotorliu/eigen,madlib/eigen_backup,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,mjbshaw/Eigen,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,madlib/eigen_backup